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"Year round comfort is a priority for SWD, that is why you can trust that your new bi-fold doors are thermally efficient. It’s often a misconception that a large amount of glass will cause too much heat to be trapped in the warm summer months. However, our versatile uPVC bi-fold doors combat that greenhouse feeling by providing the greatest amount of opening space for cool air to enter your home."
<https://www.windowsanddoorsessex.com/bi-fold-doors-basildon-essex/>